Dunham Jones Crain (February 28, 1831 Cullen, Herkimer County, New York – May 17, 1908 New York City) was an American politician and diplomat from New York.
He was the son of William C. Crain and Perses Narina (Tunnicliff) Crain. He graduated from Union College. Then he studied law at Cooperstown, was admitted to the bar, and practiced with the firm of Barney & Butler in New York City. Later he became a partner in the firm of Stewart, Stallknecht & Crain.
He was a Democratic member of the New York State Assembly (NYC 14th D.) in 1858. In 1859, he married Hannah Ann Crocker (d. 1914), and their children were New York D.A. Thomas C. T. Crain, Christobelle Crain and Davida Crocker Crain. In 1877, he was appointed by President Rutherford B. Hayes as U.S. Consul in Milan and served until 1884.